Appears on the main toolbar when the Mirror command is active, and allows you to either specify mirroring options or to observe mirroring options.
Copy
Copies the item or items when you mirror them.
Position Angle
Sets the angle of the mirror axis. The origin of the angle measurement is the point that you selected for the beginning of the mirror axis. Setting the position angle to zero extends the axis horizontally to the right of the screen, 90 extends the axis vertically to the top, 180 extends the axis horizontally to the left, and 270 extends the axis vertically to the bottom.